Interface RealtimeCheckpointStore

interface RealtimeCheckpointStore {
    load(
        context: RealtimeResumeContextV1,
        signal: AbortSignal,
    ): Promise<RealtimeDurableCheckpointV1 | undefined>;
    save(
        checkpoint: RealtimeDurableCheckpointV1,
        signal: AbortSignal,
    ): Promise<void>;
}